You have to be careful about how low you score. Some bookers will definitely take you off their customer lists if they think your review hurt a girl's business, whether she deserved it or not.
This is the double-edged sword of TOFTT. You will find some undiscovered gems and get to see them a few times before they get too busy. On the other hand, you will get some that you wish you had not wasted your time on.
In many cases with new girls, the first one or two reviews are shill reviews. I'm not saying that the reviewers did not see the girl, but bookers have a few guys that they will allow to see a girl the first day in exchange for a positive review, regardless of whether the girl was good or not. If you don't like the risk that comes with TOFTT, then you should wait until there are four or five reviews up, and see if the scores are holding at a high level or falling as more reviews go up. Many girls stay at 9/9 the first week or two, but then a month later they are 8.4/8.2 by the time they get a dozen reviews.
Since I have been reviewing on TER, my lowest score for looks or performance was a 7. On the previous site where I reviewed, my lowest for looks was a 6 and for performance was a 5, but I maintain anonymity with my TER handle, so impossible for me to get blacklisted over a low score. As you get better at dissecting the reviews to find girls you are more likely to connect with, your scores will be higher, because you will eliminate the duds by identifying red flags in other reviews.